19240421 has 4 divisors (see below), whose sum is σ = 19249632. Its totient is φ = 19231212.

The previous prime is 19240411. The next prime is 19240433. The reversal of 19240421 is 12404291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 19240421 - 2¹⁸ = 18978277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19240411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200 + ... + 6206.

It is an arithmetic number, because the mean of its divisors is an integer number (4812408).

Almost surely, 2^19240421 is an apocalyptic number.

It is an amenable number.

19240421 is a deficient number, since it is larger than the sum of its proper divisors (9211).

19240421 is an equidigital number, since it uses as much as digits as its factorization.

19240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9210.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 19240421 is about 4386.3904294990. The cubic root of 19240421 is about 267.9609590787.

The spelling of 19240421 in words is "nineteen million, two hundred forty thousand, four hundred twenty-one".